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The movement of adult Cryptolestes ferrugineus (Stephens) was determined in the presence of CO2 in wheat at 27 ± 1. CO2 gradients were formed in 1.5-m-long vertical or horizontal columns of wheat that were divided into 10 equal sections. Adult C. ferrugineus placed at the top of vertical columns of wheat moved downward 3 times more rapidly through a CO2 concentration difference of 1-43% CO2 (top to bottom) than in controls in ambient air. Adults placed in the center of horizontal columns moved equally in both directions in controls but were attracted to the higher levels of CO2 under gas concentration gradients ranging from 3 to 37%. More than half the insects were dead at 72 h in CO2 levels above 31 %. Adult C. ferrugineus placed in groups of 20 at each of the five sections with the lowest CO2 levels moved throughout the columns, but their distribution in controls or under gas concentrations of 2-34% CO2 was not different at 72 h, indicating slow movement even in the presence of an attractant. Because added CO2 accumulates in lower regions of grain bulks, storage operators may be able to use the positive geotropism of adult C. ferrugineus and the tendency of the insect to be attracted to high CO2 levels to assist in the control of this pest with controlled atmospheres.
Document Type: Research Article
Publication date: December 1, 1993
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.